qom/object.c

   1 /*
   2  * QEMU Object Model
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qapi/error.h"
  15 #include "qom/object.h"
  16 #include "qom/object_interfaces.h"
  17 #include "qemu/cutils.h"
  18 #include "qapi/visitor.h"
  19 #include "qapi/string-input-visitor.h"
  20 #include "qapi/string-output-visitor.h"
  21 #include "qapi/qapi-builtin-visit.h"
  22 #include "qapi/qmp/qerror.h"
  23 #include "trace.h"
  24
  25 /* TODO: replace QObject with a simpler visitor to avoid a dependency
  26  * of the QOM core on QObject?  */
  27 #include "qom/qom-qobject.h"
  28 #include "qapi/qmp/qbool.h"
  29 #include "qapi/qmp/qnum.h"
  30 #include "qapi/qmp/qstring.h"
  31
  32 #define MAX_INTERFACES 32
  33
  34 typedef struct InterfaceImpl InterfaceImpl;
  35 typedef struct TypeImpl TypeImpl;
  36
  37 struct InterfaceImpl
  38 {
  39     const char *typename;
  40 };
  41
  42 struct TypeImpl
  43 {
  44     const char *name;
  45
  46     size_t class_size;
  47
  48     size_t instance_size;
  49
  50     void (*class_init)(ObjectClass *klass, void *data);
  51     void (*class_base_init)(ObjectClass *klass, void *data);
  52     void (*class_finalize)(ObjectClass *klass, void *data);
  53
  54     void *class_data;
  55
  56     void (*instance_init)(Object *obj);
  57     void (*instance_post_init)(Object *obj);
  58     void (*instance_finalize)(Object *obj);
  59
  60     bool abstract;
  61
  62     const char *parent;
  63     TypeImpl *parent_type;
  64
  65     ObjectClass *class;
  66
  67     int num_interfaces;
  68     InterfaceImpl interfaces[MAX_INTERFACES];
  69 };
  70
  71 static Type type_interface;
  72
  73 static GHashTable *type_table_get(void)
  74 {
  75     static GHashTable *type_table;
  76
  77     if (type_table == NULL) {
  78         type_table = g_hash_table_new(g_str_hash, g_str_equal);
  79     }
  80
  81     return type_table;
  82 }
  83
  84 static bool enumerating_types;
  85
  86 static void type_table_add(TypeImpl *ti)
  87 {
  88     assert(!enumerating_types);
  89     g_hash_table_insert(type_table_get(), (void *)ti->name, ti);
  90 }
  91
  92 static TypeImpl *type_table_lookup(const char *name)
  93 {
  94     return g_hash_table_lookup(type_table_get(), name);
  95 }
  96
  97 static TypeImpl *type_new(const TypeInfo *info)
  98 {
  99     TypeImpl *ti = g_malloc0(sizeof(*ti));
 100     int i;
 101
 102     g_assert(info->name != NULL);
 103
 104     if (type_table_lookup(info->name) != NULL) {
 105         fprintf(stderr, "Registering `%s' which already exists\n", info->name);
 106         abort();
 107     }
 108
 109     ti->name = g_strdup(info->name);
 110     ti->parent = g_strdup(info->parent);
 111
 112     ti->class_size = info->class_size;
 113     ti->instance_size = info->instance_size;
 114
 115     ti->class_init = info->class_init;
 116     ti->class_base_init = info->class_base_init;
 117     ti->class_finalize = info->class_finalize;
 118     ti->class_data = info->class_data;
 119
 120     ti->instance_init = info->instance_init;
 121     ti->instance_post_init = info->instance_post_init;
 122     ti->instance_finalize = info->instance_finalize;
 123
 124     ti->abstract = info->abstract;
 125
 126     for (i = 0; info->interfaces && info->interfaces[i].type; i++) {
 127         ti->interfaces[i].typename = g_strdup(info->interfaces[i].type);
 128     }
 129     ti->num_interfaces = i;
 130
 131     return ti;
 132 }
 133
 134 static TypeImpl *type_register_internal(const TypeInfo *info)
 135 {
 136     TypeImpl *ti;
 137     ti = type_new(info);
 138
 139     type_table_add(ti);
 140     return ti;
 141 }
 142
 143 TypeImpl *type_register(const TypeInfo *info)
 144 {
 145     assert(info->parent);
 146     return type_register_internal(info);
 147 }
 148
 149 TypeImpl *type_register_static(const TypeInfo *info)
 150 {
 151     return type_register(info);
 152 }
 153
 154 void type_register_static_array(const TypeInfo *infos, int nr_infos)
 155 {
 156     int i;
 157
 158     for (i = 0; i < nr_infos; i++) {
 159         type_register_static(&infos[i]);
 160     }
 161 }
 162
 163 static TypeImpl *type_get_by_name(const char *name)
 164 {
 165     if (name == NULL) {
 166         return NULL;
 167     }
 168
 169     return type_table_lookup(name);
 170 }
 171
 172 static TypeImpl *type_get_parent(TypeImpl *type)
 173 {
 174     if (!type->parent_type && type->parent) {
 175         type->parent_type = type_get_by_name(type->parent);
 176         g_assert(type->parent_type != NULL);
 177     }
 178
 179     return type->parent_type;
 180 }
 181
 182 static bool type_has_parent(TypeImpl *type)
 183 {
 184     return (type->parent != NULL);
 185 }
 186
 187 static size_t type_class_get_size(TypeImpl *ti)
 188 {
 189     if (ti->class_size) {
 190         return ti->class_size;
 191     }
 192
 193     if (type_has_parent(ti)) {
 194         return type_class_get_size(type_get_parent(ti));
 195     }
 196
 197     return sizeof(ObjectClass);
 198 }
 199
 200 static size_t type_object_get_size(TypeImpl *ti)
 201 {
 202     if (ti->instance_size) {
 203         return ti->instance_size;
 204     }
 205
 206     if (type_has_parent(ti)) {
 207         return type_object_get_size(type_get_parent(ti));
 208     }
 209
 210     return 0;
 211 }
 212
 213 size_t object_type_get_instance_size(const char *typename)
 214 {
 215     TypeImpl *type = type_get_by_name(typename);
 216
 217     g_assert(type != NULL);
 218     return type_object_get_size(type);
 219 }
 220
 221 static bool type_is_ancestor(TypeImpl *type, TypeImpl *target_type)
 222 {
 223     assert(target_type);
 224
 225     /* Check if target_type is a direct ancestor of type */
 226     while (type) {
 227         if (type == target_type) {
 228             return true;
 229         }
 230
 231         type = type_get_parent(type);
 232     }
 233
 234     return false;
 235 }
 236
 237 static void type_initialize(TypeImpl *ti);
 238
 239 static void type_initialize_interface(TypeImpl *ti, TypeImpl *interface_type,
 240                                       TypeImpl *parent_type)
 241 {
 242     InterfaceClass *new_iface;
 243     TypeInfo info = { };
 244     TypeImpl *iface_impl;
 245
 246     info.parent = parent_type->name;
 247     info.name = g_strdup_printf("%s::%s", ti->name, interface_type->name);
 248     info.abstract = true;
 249
 250     iface_impl = type_new(&info);
 251     iface_impl->parent_type = parent_type;
 252     type_initialize(iface_impl);
 253     g_free((char *)info.name);
 254
 255     new_iface = (InterfaceClass *)iface_impl->class;
 256     new_iface->concrete_class = ti->class;
 257     new_iface->interface_type = interface_type;
 258
 259     ti->class->interfaces = g_slist_append(ti->class->interfaces,
 260                                            iface_impl->class);
 261 }
 262
 263 static void object_property_free(gpointer data)
 264 {
 265     ObjectProperty *prop = data;
 266
 267     g_free(prop->name);
 268     g_free(prop->type);
 269     g_free(prop->description);
 270     g_free(prop);
 271 }
 272
 273 static void type_initialize(TypeImpl *ti)
 274 {
 275     TypeImpl *parent;
 276
 277     if (ti->class) {
 278         return;
 279     }
 280
 281     ti->class_size = type_class_get_size(ti);
 282     ti->instance_size = type_object_get_size(ti);
 283     /* Any type with zero instance_size is implicitly abstract.
 284      * This means interface types are all abstract.
 285      */
 286     if (ti->instance_size == 0) {
 287         ti->abstract = true;
 288     }
 289
 290     ti->class = g_malloc0(ti->class_size);
 291
 292     parent = type_get_parent(ti);
 293     if (parent) {
 294         type_initialize(parent);
 295         GSList *e;
 296         int i;
 297
 298         g_assert_cmpint(parent->class_size, <=, ti->class_size);
 299         memcpy(ti->class, parent->class, parent->class_size);
 300         ti->class->interfaces = NULL;
 301         ti->class->properties = g_hash_table_new_full(
 302             g_str_hash, g_str_equal, g_free, object_property_free);
 303
 304         for (e = parent->class->interfaces; e; e = e->next) {
 305             InterfaceClass *iface = e->data;
 306             ObjectClass *klass = OBJECT_CLASS(iface);
 307
 308             type_initialize_interface(ti, iface->interface_type, klass->type);
 309         }
 310
 311         for (i = 0; i < ti->num_interfaces; i++) {
 312             TypeImpl *t = type_get_by_name(ti->interfaces[i].typename);
 313             for (e = ti->class->interfaces; e; e = e->next) {
 314                 TypeImpl *target_type = OBJECT_CLASS(e->data)->type;
 315
 316                 if (type_is_ancestor(target_type, t)) {
 317                     break;
 318                 }
 319             }
 320
 321             if (e) {
 322                 continue;
 323             }
 324
 325             type_initialize_interface(ti, t, t);
 326         }
 327     } else {
 328         ti->class->properties = g_hash_table_new_full(
 329             g_str_hash, g_str_equal, g_free, object_property_free);
 330     }
 331
 332     ti->class->type = ti;
 333
 334     while (parent) {
 335         if (parent->class_base_init) {
 336             parent->class_base_init(ti->class, ti->class_data);
 337         }
 338         parent = type_get_parent(parent);
 339     }
 340
 341     if (ti->class_init) {
 342         ti->class_init(ti->class, ti->class_data);
 343     }
 344 }
 345
 346 static void object_init_with_type(Object *obj, TypeImpl *ti)
 347 {
 348     if (type_has_parent(ti)) {
 349         object_init_with_type(obj, type_get_parent(ti));
 350     }
 351
 352     if (ti->instance_init) {
 353         ti->instance_init(obj);
 354     }
 355 }
 356
 357 static void object_post_init_with_type(Object *obj, TypeImpl *ti)
 358 {
 359     if (ti->instance_post_init) {
 360         ti->instance_post_init(obj);
 361     }
 362
 363     if (type_has_parent(ti)) {
 364         object_post_init_with_type(obj, type_get_parent(ti));
 365     }
 366 }
 367
 368 static void object_initialize_with_type(void *data, size_t size, TypeImpl *type)
 369 {
 370     Object *obj = data;
 371
 372     g_assert(type != NULL);
 373     type_initialize(type);
 374
 375     g_assert_cmpint(type->instance_size, >=, sizeof(Object));
 376     g_assert(type->abstract == false);
 377     g_assert_cmpint(size, >=, type->instance_size);
 378
 379     memset(obj, 0, type->instance_size);
 380     obj->class = type->class;
 381     object_ref(obj);
 382     obj->properties = g_hash_table_new_full(g_str_hash, g_str_equal,
 383                                             NULL, object_property_free);
 384     object_init_with_type(obj, type);
 385     object_post_init_with_type(obj, type);
 386 }
 387
 388 void object_initialize(void *data, size_t size, const char *typename)
 389 {
 390     TypeImpl *type = type_get_by_name(typename);
 391
 392     object_initialize_with_type(data, size, type);
 393 }
 394
 395 static inline bool object_property_is_child(ObjectProperty *prop)
 396 {
 397     return strstart(prop->type, "child<", NULL);
 398 }
 399
 400 static void object_property_del_all(Object *obj)
 401 {
 402     ObjectProperty *prop;
 403     GHashTableIter iter;
 404     gpointer key, value;
 405     bool released;
 406
 407     do {
 408         released = false;
 409         g_hash_table_iter_init(&iter, obj->properties);
 410         while (g_hash_table_iter_next(&iter, &key, &value)) {
 411             prop = value;
 412             if (prop->release) {
 413                 prop->release(obj, prop->name, prop->opaque);
 414                 prop->release = NULL;
 415                 released = true;
 416                 break;
 417             }
 418             g_hash_table_iter_remove(&iter);
 419         }
 420     } while (released);
 421
 422     g_hash_table_unref(obj->properties);
 423 }
 424
 425 static void object_property_del_child(Object *obj, Object *child, Error **errp)
 426 {
 427     ObjectProperty *prop;
 428     GHashTableIter iter;
 429     gpointer key, value;
 430
 431     g_hash_table_iter_init(&iter, obj->properties);
 432     while (g_hash_table_iter_next(&iter, &key, &value)) {
 433         prop = value;
 434         if (object_property_is_child(prop) && prop->opaque == child) {
 435             if (prop->release) {
 436                 prop->release(obj, prop->name, prop->opaque);
 437                 prop->release = NULL;
 438             }
 439             break;
 440         }
 441     }
 442     g_hash_table_iter_init(&iter, obj->properties);
 443     while (g_hash_table_iter_next(&iter, &key, &value)) {
 444         prop = value;
 445         if (object_property_is_child(prop) && prop->opaque == child) {
 446             g_hash_table_iter_remove(&iter);
 447             break;
 448         }
 449     }
 450 }
 451
 452 void object_unparent(Object *obj)
 453 {
 454     if (obj->parent) {
 455         object_property_del_child(obj->parent, obj, NULL);
 456     }
 457 }
 458
 459 static void object_deinit(Object *obj, TypeImpl *type)
 460 {
 461     if (type->instance_finalize) {
 462         type->instance_finalize(obj);
 463     }
 464
 465     if (type_has_parent(type)) {
 466         object_deinit(obj, type_get_parent(type));
 467     }
 468 }
 469
 470 static void object_finalize(void *data)
 471 {
 472     Object *obj = data;
 473     TypeImpl *ti = obj->class->type;
 474
 475     object_property_del_all(obj);
 476     object_deinit(obj, ti);
 477
 478     g_assert_cmpint(obj->ref, ==, 0);
 479     if (obj->free) {
 480         obj->free(obj);
 481     }
 482 }
 483
 484 static Object *object_new_with_type(Type type)
 485 {
 486     Object *obj;
 487
 488     g_assert(type != NULL);
 489     type_initialize(type);
 490
 491     obj = g_malloc(type->instance_size);
 492     object_initialize_with_type(obj, type->instance_size, type);
 493     obj->free = g_free;
 494
 495     return obj;
 496 }
 497
 498 Object *object_new(const char *typename)
 499 {
 500     TypeImpl *ti = type_get_by_name(typename);
 501
 502     return object_new_with_type(ti);
 503 }
 504
 505
 506 Object *object_new_with_props(const char *typename,
 507                               Object *parent,
 508                               const char *id,
 509                               Error **errp,
 510                               ...)
 511 {
 512     va_list vargs;
 513     Object *obj;
 514
 515     va_start(vargs, errp);
 516     obj = object_new_with_propv(typename, parent, id, errp, vargs);
 517     va_end(vargs);
 518
 519     return obj;
 520 }
 521
 522
 523 Object *object_new_with_propv(const char *typename,
 524                               Object *parent,
 525                               const char *id,
 526                               Error **errp,
 527                               va_list vargs)
 528 {
 529     Object *obj;
 530     ObjectClass *klass;
 531     Error *local_err = NULL;
 532
 533     klass = object_class_by_name(typename);
 534     if (!klass) {
 535         error_setg(errp, "invalid object type: %s", typename);
 536         return NULL;
 537     }
 538
 539     if (object_class_is_abstract(klass)) {
 540         error_setg(errp, "object type '%s' is abstract", typename);
 541         return NULL;
 542     }
 543     obj = object_new(typename);
 544
 545     if (object_set_propv(obj, &local_err, vargs) < 0) {
 546         goto error;
 547     }
 548
 549     object_property_add_child(parent, id, obj, &local_err);
 550     if (local_err) {
 551         goto error;
 552     }
 553
 554     if (object_dynamic_cast(obj, TYPE_USER_CREATABLE)) {
 555         user_creatable_complete(obj, &local_err);
 556         if (local_err) {
 557             object_unparent(obj);
 558             goto error;
 559         }
 560     }
 561
 562     object_unref(OBJECT(obj));
 563     return obj;
 564
 565  error:
 566     error_propagate(errp, local_err);
 567     object_unref(obj);
 568     return NULL;
 569 }
 570
 571
 572 int object_set_props(Object *obj,
 573                      Error **errp,
 574                      ...)
 575 {
 576     va_list vargs;
 577     int ret;
 578
 579     va_start(vargs, errp);
 580     ret = object_set_propv(obj, errp, vargs);
 581     va_end(vargs);
 582
 583     return ret;
 584 }
 585
 586
 587 int object_set_propv(Object *obj,
 588                      Error **errp,
 589                      va_list vargs)
 590 {
 591     const char *propname;
 592     Error *local_err = NULL;
 593
 594     propname = va_arg(vargs, char *);
 595     while (propname != NULL) {
 596         const char *value = va_arg(vargs, char *);
 597
 598         g_assert(value != NULL);
 599         object_property_parse(obj, value, propname, &local_err);
 600         if (local_err) {
 601             error_propagate(errp, local_err);
 602             return -1;
 603         }
 604         propname = va_arg(vargs, char *);
 605     }
 606
 607     return 0;
 608 }
 609
 610
 611 Object *object_dynamic_cast(Object *obj, const char *typename)
 612 {
 613     if (obj && object_class_dynamic_cast(object_get_class(obj), typename)) {
 614         return obj;
 615     }
 616
 617     return NULL;
 618 }
 619
 620 Object *object_dynamic_cast_assert(Object *obj, const char *typename,
 621                                    const char *file, int line, const char *func)
 622 {
 623     trace_object_dynamic_cast_assert(obj ? obj->class->type->name : "(null)",
 624                                      typename, file, line, func);
 625
 626 #ifdef CONFIG_QOM_CAST_DEBUG
 627     int i;
 628     Object *inst;
 629
 630     for (i = 0; obj && i < OBJECT_CLASS_CAST_CACHE; i++) {
 631         if (atomic_read(&obj->class->object_cast_cache[i]) == typename) {
 632             goto out;
 633         }
 634     }
 635
 636     inst = object_dynamic_cast(obj, typename);
 637
 638     if (!inst && obj) {
 639         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 640                 file, line, func, obj, typename);
 641         abort();
 642     }
 643
 644     assert(obj == inst);
 645
 646     if (obj && obj == inst) {
 647         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 648             atomic_set(&obj->class->object_cast_cache[i - 1],
 649                        atomic_read(&obj->class->object_cast_cache[i]));
 650         }
 651         atomic_set(&obj->class->object_cast_cache[i - 1], typename);
 652     }
 653
 654 out:
 655 #endif
 656     return obj;
 657 }
 658
 659 ObjectClass *object_class_dynamic_cast(ObjectClass *class,
 660                                        const char *typename)
 661 {
 662     ObjectClass *ret = NULL;
 663     TypeImpl *target_type;
 664     TypeImpl *type;
 665
 666     if (!class) {
 667         return NULL;
 668     }
 669
 670     /* A simple fast path that can trigger a lot for leaf classes.  */
 671     type = class->type;
 672     if (type->name == typename) {
 673         return class;
 674     }
 675
 676     target_type = type_get_by_name(typename);
 677     if (!target_type) {
 678         /* target class type unknown, so fail the cast */
 679         return NULL;
 680     }
 681
 682     if (type->class->interfaces &&
 683             type_is_ancestor(target_type, type_interface)) {
 684         int found = 0;
 685         GSList *i;
 686
 687         for (i = class->interfaces; i; i = i->next) {
 688             ObjectClass *target_class = i->data;
 689
 690             if (type_is_ancestor(target_class->type, target_type)) {
 691                 ret = target_class;
 692                 found++;
 693             }
 694          }
 695
 696         /* The match was ambiguous, don't allow a cast */
 697         if (found > 1) {
 698             ret = NULL;
 699         }
 700     } else if (type_is_ancestor(type, target_type)) {
 701         ret = class;
 702     }
 703
 704     return ret;
 705 }
 706
 707 ObjectClass *object_class_dynamic_cast_assert(ObjectClass *class,
 708                                               const char *typename,
 709                                               const char *file, int line,
 710                                               const char *func)
 711 {
 712     ObjectClass *ret;
 713
 714     trace_object_class_dynamic_cast_assert(class ? class->type->name : "(null)",
 715                                            typename, file, line, func);
 716
 717 #ifdef CONFIG_QOM_CAST_DEBUG
 718     int i;
 719
 720     for (i = 0; class && i < OBJECT_CLASS_CAST_CACHE; i++) {
 721         if (atomic_read(&class->class_cast_cache[i]) == typename) {
 722             ret = class;
 723             goto out;
 724         }
 725     }
 726 #else
 727     if (!class || !class->interfaces) {
 728         return class;
 729     }
 730 #endif
 731
 732     ret = object_class_dynamic_cast(class, typename);
 733     if (!ret && class) {
 734         fprintf(stderr, "%s:%d:%s: Object %p is not an instance of type %s\n",
 735                 file, line, func, class, typename);
 736         abort();
 737     }
 738
 739 #ifdef CONFIG_QOM_CAST_DEBUG
 740     if (class && ret == class) {
 741         for (i = 1; i < OBJECT_CLASS_CAST_CACHE; i++) {
 742             atomic_set(&class->class_cast_cache[i - 1],
 743                        atomic_read(&class->class_cast_cache[i]));
 744         }
 745         atomic_set(&class->class_cast_cache[i - 1], typename);
 746     }
 747 out:
 748 #endif
 749     return ret;
 750 }
 751
 752 const char *object_get_typename(const Object *obj)
 753 {
 754     return obj->class->type->name;
 755 }
 756
 757 ObjectClass *object_get_class(Object *obj)
 758 {
 759     return obj->class;
 760 }
 761
 762 bool object_class_is_abstract(ObjectClass *klass)
 763 {
 764     return klass->type->abstract;
 765 }
 766
 767 const char *object_class_get_name(ObjectClass *klass)
 768 {
 769     return klass->type->name;
 770 }
 771
 772 ObjectClass *object_class_by_name(const char *typename)
 773 {
 774     TypeImpl *type = type_get_by_name(typename);
 775
 776     if (!type) {
 777         return NULL;
 778     }
 779
 780     type_initialize(type);
 781
 782     return type->class;
 783 }
 784
 785 ObjectClass *object_class_get_parent(ObjectClass *class)
 786 {
 787     TypeImpl *type = type_get_parent(class->type);
 788
 789     if (!type) {
 790         return NULL;
 791     }
 792
 793     type_initialize(type);
 794
 795     return type->class;
 796 }
 797
 798 typedef struct OCFData
 799 {
 800     void (*fn)(ObjectClass *klass, void *opaque);
 801     const char *implements_type;
 802     bool include_abstract;
 803     void *opaque;
 804 } OCFData;
 805
 806 static void object_class_foreach_tramp(gpointer key, gpointer value,
 807                                        gpointer opaque)
 808 {
 809     OCFData *data = opaque;
 810     TypeImpl *type = value;
 811     ObjectClass *k;
 812
 813     type_initialize(type);
 814     k = type->class;
 815
 816     if (!data->include_abstract && type->abstract) {
 817         return;
 818     }
 819
 820     if (data->implements_type &&
 821         !object_class_dynamic_cast(k, data->implements_type)) {
 822         return;
 823     }
 824
 825     data->fn(k, data->opaque);
 826 }
 827
 828 void object_class_foreach(void (*fn)(ObjectClass *klass, void *opaque),
 829                           const char *implements_type, bool include_abstract,
 830                           void *opaque)
 831 {
 832     OCFData data = { fn, implements_type, include_abstract, opaque };
 833
 834     enumerating_types = true;
 835     g_hash_table_foreach(type_table_get(), object_class_foreach_tramp, &data);
 836     enumerating_types = false;
 837 }
 838
 839 static int do_object_child_foreach(Object *obj,
 840                                    int (*fn)(Object *child, void *opaque),
 841                                    void *opaque, bool recurse)
 842 {
 843     GHashTableIter iter;
 844     ObjectProperty *prop;
 845     int ret = 0;
 846
 847     g_hash_table_iter_init(&iter, obj->properties);
 848     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
 849         if (object_property_is_child(prop)) {
 850             Object *child = prop->opaque;
 851
 852             ret = fn(child, opaque);
 853             if (ret != 0) {
 854                 break;
 855             }
 856             if (recurse) {
 857                 do_object_child_foreach(child, fn, opaque, true);
 858             }
 859         }
 860     }
 861     return ret;
 862 }
 863
 864 int object_child_foreach(Object *obj, int (*fn)(Object *child, void *opaque),
 865                          void *opaque)
 866 {
 867     return do_object_child_foreach(obj, fn, opaque, false);
 868 }
 869
 870 int object_child_foreach_recursive(Object *obj,
 871                                    int (*fn)(Object *child, void *opaque),
 872                                    void *opaque)
 873 {
 874     return do_object_child_foreach(obj, fn, opaque, true);
 875 }
 876
 877 static void object_class_get_list_tramp(ObjectClass *klass, void *opaque)
 878 {
 879     GSList **list = opaque;
 880
 881     *list = g_slist_prepend(*list, klass);
 882 }
 883
 884 GSList *object_class_get_list(const char *implements_type,
 885                               bool include_abstract)
 886 {
 887     GSList *list = NULL;
 888
 889     object_class_foreach(object_class_get_list_tramp,
 890                          implements_type, include_abstract, &list);
 891     return list;
 892 }
 893
 894 void object_ref(Object *obj)
 895 {
 896     if (!obj) {
 897         return;
 898     }
 899     atomic_inc(&obj->ref);
 900 }
 901
 902 void object_unref(Object *obj)
 903 {
 904     if (!obj) {
 905         return;
 906     }
 907     g_assert_cmpint(obj->ref, >, 0);
 908
 909     /* parent always holds a reference to its children */
 910     if (atomic_fetch_dec(&obj->ref) == 1) {
 911         object_finalize(obj);
 912     }
 913 }
 914
 915 ObjectProperty *
 916 object_property_add(Object *obj, const char *name, const char *type,
 917                     ObjectPropertyAccessor *get,
 918                     ObjectPropertyAccessor *set,
 919                     ObjectPropertyRelease *release,
 920                     void *opaque, Error **errp)
 921 {
 922     ObjectProperty *prop;
 923     size_t name_len = strlen(name);
 924
 925     if (name_len >= 3 && !memcmp(name + name_len - 3, "[*]", 4)) {
 926         int i;
 927         ObjectProperty *ret;
 928         char *name_no_array = g_strdup(name);
 929
 930         name_no_array[name_len - 3] = '\0';
 931         for (i = 0; ; ++i) {
 932             char *full_name = g_strdup_printf("%s[%d]", name_no_array, i);
 933
 934             ret = object_property_add(obj, full_name, type, get, set,
 935                                       release, opaque, NULL);
 936             g_free(full_name);
 937             if (ret) {
 938                 break;
 939             }
 940         }
 941         g_free(name_no_array);
 942         return ret;
 943     }
 944
 945     if (object_property_find(obj, name, NULL) != NULL) {
 946         error_setg(errp, "attempt to add duplicate property '%s'"
 947                    " to object (type '%s')", name,
 948                    object_get_typename(obj));
 949         return NULL;
 950     }
 951
 952     prop = g_malloc0(sizeof(*prop));
 953
 954     prop->name = g_strdup(name);
 955     prop->type = g_strdup(type);
 956
 957     prop->get = get;
 958     prop->set = set;
 959     prop->release = release;
 960     prop->opaque = opaque;
 961
 962     g_hash_table_insert(obj->properties, prop->name, prop);
 963     return prop;
 964 }
 965
 966 ObjectProperty *
 967 object_class_property_add(ObjectClass *klass,
 968                           const char *name,
 969                           const char *type,
 970                           ObjectPropertyAccessor *get,
 971                           ObjectPropertyAccessor *set,
 972                           ObjectPropertyRelease *release,
 973                           void *opaque,
 974                           Error **errp)
 975 {
 976     ObjectProperty *prop;
 977
 978     if (object_class_property_find(klass, name, NULL) != NULL) {
 979         error_setg(errp, "attempt to add duplicate property '%s'"
 980                    " to object (type '%s')", name,
 981                    object_class_get_name(klass));
 982         return NULL;
 983     }
 984
 985     prop = g_malloc0(sizeof(*prop));
 986
 987     prop->name = g_strdup(name);
 988     prop->type = g_strdup(type);
 989
 990     prop->get = get;
 991     prop->set = set;
 992     prop->release = release;
 993     prop->opaque = opaque;
 994
 995     g_hash_table_insert(klass->properties, g_strdup(name), prop);
 996
 997     return prop;
 998 }
 999
1000 ObjectProperty *object_property_find(Object *obj, const char *name,
1001                                      Error **errp)
1002 {
1003     ObjectProperty *prop;
1004     ObjectClass *klass = object_get_class(obj);
1005
1006     prop = object_class_property_find(klass, name, NULL);
1007     if (prop) {
1008         return prop;
1009     }
1010
1011     prop = g_hash_table_lookup(obj->properties, name);
1012     if (prop) {
1013         return prop;
1014     }
1015
1016     error_setg(errp, "Property '.%s' not found", name);
1017     return NULL;
1018 }
1019
1020 void object_property_iter_init(ObjectPropertyIterator *iter,
1021                                Object *obj)
1022 {
1023     g_hash_table_iter_init(&iter->iter, obj->properties);
1024     iter->nextclass = object_get_class(obj);
1025 }
1026
1027 ObjectProperty *object_property_iter_next(ObjectPropertyIterator *iter)
1028 {
1029     gpointer key, val;
1030     while (!g_hash_table_iter_next(&iter->iter, &key, &val)) {
1031         if (!iter->nextclass) {
1032             return NULL;
1033         }
1034         g_hash_table_iter_init(&iter->iter, iter->nextclass->properties);
1035         iter->nextclass = object_class_get_parent(iter->nextclass);
1036     }
1037     return val;
1038 }
1039
1040 void object_class_property_iter_init(ObjectPropertyIterator *iter,
1041                                      ObjectClass *klass)
1042 {
1043     g_hash_table_iter_init(&iter->iter, klass->properties);
1044     iter->nextclass = klass;
1045 }
1046
1047 ObjectProperty *object_class_property_find(ObjectClass *klass, const char *name,
1048                                            Error **errp)
1049 {
1050     ObjectProperty *prop;
1051     ObjectClass *parent_klass;
1052
1053     parent_klass = object_class_get_parent(klass);
1054     if (parent_klass) {
1055         prop = object_class_property_find(parent_klass, name, NULL);
1056         if (prop) {
1057             return prop;
1058         }
1059     }
1060
1061     prop = g_hash_table_lookup(klass->properties, name);
1062     if (!prop) {
1063         error_setg(errp, "Property '.%s' not found", name);
1064     }
1065     return prop;
1066 }
1067
1068 void object_property_del(Object *obj, const char *name, Error **errp)
1069 {
1070     ObjectProperty *prop = g_hash_table_lookup(obj->properties, name);
1071
1072     if (!prop) {
1073         error_setg(errp, "Property '.%s' not found", name);
1074         return;
1075     }
1076
1077     if (prop->release) {
1078         prop->release(obj, name, prop->opaque);
1079     }
1080     g_hash_table_remove(obj->properties, name);
1081 }
1082
1083 void object_property_get(Object *obj, Visitor *v, const char *name,
1084                          Error **errp)
1085 {
1086     ObjectProperty *prop = object_property_find(obj, name, errp);
1087     if (prop == NULL) {
1088         return;
1089     }
1090
1091     if (!prop->get) {
1092         error_setg(errp, QERR_PERMISSION_DENIED);
1093     } else {
1094         prop->get(obj, v, name, prop->opaque, errp);
1095     }
1096 }
1097
1098 void object_property_set(Object *obj, Visitor *v, const char *name,
1099                          Error **errp)
1100 {
1101     ObjectProperty *prop = object_property_find(obj, name, errp);
1102     if (prop == NULL) {
1103         return;
1104     }
1105
1106     if (!prop->set) {
1107         error_setg(errp, QERR_PERMISSION_DENIED);
1108     } else {
1109         prop->set(obj, v, name, prop->opaque, errp);
1110     }
1111 }
1112
1113 void object_property_set_str(Object *obj, const char *value,
1114                              const char *name, Error **errp)
1115 {
1116     QString *qstr = qstring_from_str(value);
1117     object_property_set_qobject(obj, QOBJECT(qstr), name, errp);
1118
1119     QDECREF(qstr);
1120 }
1121
1122 char *object_property_get_str(Object *obj, const char *name,
1123                               Error **errp)
1124 {
1125     QObject *ret = object_property_get_qobject(obj, name, errp);
1126     QString *qstring;
1127     char *retval;
1128
1129     if (!ret) {
1130         return NULL;
1131     }
1132     qstring = qobject_to_qstring(ret);
1133     if (!qstring) {
1134         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "string");
1135         retval = NULL;
1136     } else {
1137         retval = g_strdup(qstring_get_str(qstring));
1138     }
1139
1140     qobject_decref(ret);
1141     return retval;
1142 }
1143
1144 void object_property_set_link(Object *obj, Object *value,
1145                               const char *name, Error **errp)
1146 {
1147     if (value) {
1148         gchar *path = object_get_canonical_path(value);
1149         object_property_set_str(obj, path, name, errp);
1150         g_free(path);
1151     } else {
1152         object_property_set_str(obj, "", name, errp);
1153     }
1154 }
1155
1156 Object *object_property_get_link(Object *obj, const char *name,
1157                                  Error **errp)
1158 {
1159     char *str = object_property_get_str(obj, name, errp);
1160     Object *target = NULL;
1161
1162     if (str && *str) {
1163         target = object_resolve_path(str, NULL);
1164         if (!target) {
1165             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1166                       "Device '%s' not found", str);
1167         }
1168     }
1169
1170     g_free(str);
1171     return target;
1172 }
1173
1174 void object_property_set_bool(Object *obj, bool value,
1175                               const char *name, Error **errp)
1176 {
1177     QBool *qbool = qbool_from_bool(value);
1178     object_property_set_qobject(obj, QOBJECT(qbool), name, errp);
1179
1180     QDECREF(qbool);
1181 }
1182
1183 bool object_property_get_bool(Object *obj, const char *name,
1184                               Error **errp)
1185 {
1186     QObject *ret = object_property_get_qobject(obj, name, errp);
1187     QBool *qbool;
1188     bool retval;
1189
1190     if (!ret) {
1191         return false;
1192     }
1193     qbool = qobject_to_qbool(ret);
1194     if (!qbool) {
1195         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "boolean");
1196         retval = false;
1197     } else {
1198         retval = qbool_get_bool(qbool);
1199     }
1200
1201     qobject_decref(ret);
1202     return retval;
1203 }
1204
1205 void object_property_set_int(Object *obj, int64_t value,
1206                              const char *name, Error **errp)
1207 {
1208     QNum *qnum = qnum_from_int(value);
1209     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1210
1211     QDECREF(qnum);
1212 }
1213
1214 int64_t object_property_get_int(Object *obj, const char *name,
1215                                 Error **errp)
1216 {
1217     QObject *ret = object_property_get_qobject(obj, name, errp);
1218     QNum *qnum;
1219     int64_t retval;
1220
1221     if (!ret) {
1222         return -1;
1223     }
1224
1225     qnum = qobject_to_qnum(ret);
1226     if (!qnum || !qnum_get_try_int(qnum, &retval)) {
1227         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "int");
1228         retval = -1;
1229     }
1230
1231     qobject_decref(ret);
1232     return retval;
1233 }
1234
1235 void object_property_set_uint(Object *obj, uint64_t value,
1236                               const char *name, Error **errp)
1237 {
1238     QNum *qnum = qnum_from_uint(value);
1239
1240     object_property_set_qobject(obj, QOBJECT(qnum), name, errp);
1241     QDECREF(qnum);
1242 }
1243
1244 uint64_t object_property_get_uint(Object *obj, const char *name,
1245                                   Error **errp)
1246 {
1247     QObject *ret = object_property_get_qobject(obj, name, errp);
1248     QNum *qnum;
1249     uint64_t retval;
1250
1251     if (!ret) {
1252         return 0;
1253     }
1254     qnum = qobject_to_qnum(ret);
1255     if (!qnum || !qnum_get_try_uint(qnum, &retval)) {
1256         error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, "uint");
1257         retval = 0;
1258     }
1259
1260     qobject_decref(ret);
1261     return retval;
1262 }
1263
1264 typedef struct EnumProperty {
1265     const QEnumLookup *lookup;
1266     int (*get)(Object *, Error **);
1267     void (*set)(Object *, int, Error **);
1268 } EnumProperty;
1269
1270 int object_property_get_enum(Object *obj, const char *name,
1271                              const char *typename, Error **errp)
1272 {
1273     Error *err = NULL;
1274     Visitor *v;
1275     char *str;
1276     int ret;
1277     ObjectProperty *prop = object_property_find(obj, name, errp);
1278     EnumProperty *enumprop;
1279
1280     if (prop == NULL) {
1281         return 0;
1282     }
1283
1284     if (!g_str_equal(prop->type, typename)) {
1285         error_setg(errp, "Property %s on %s is not '%s' enum type",
1286                    name, object_class_get_name(
1287                        object_get_class(obj)), typename);
1288         return 0;
1289     }
1290
1291     enumprop = prop->opaque;
1292
1293     v = string_output_visitor_new(false, &str);
1294     object_property_get(obj, v, name, &err);
1295     if (err) {
1296         error_propagate(errp, err);
1297         visit_free(v);
1298         return 0;
1299     }
1300     visit_complete(v, &str);
1301     visit_free(v);
1302     v = string_input_visitor_new(str);
1303     visit_type_enum(v, name, &ret, enumprop->lookup, errp);
1304
1305     g_free(str);
1306     visit_free(v);
1307
1308     return ret;
1309 }
1310
1311 void object_property_get_uint16List(Object *obj, const char *name,
1312                                     uint16List **list, Error **errp)
1313 {
1314     Error *err = NULL;
1315     Visitor *v;
1316     char *str;
1317
1318     v = string_output_visitor_new(false, &str);
1319     object_property_get(obj, v, name, &err);
1320     if (err) {
1321         error_propagate(errp, err);
1322         goto out;
1323     }
1324     visit_complete(v, &str);
1325     visit_free(v);
1326     v = string_input_visitor_new(str);
1327     visit_type_uint16List(v, NULL, list, errp);
1328
1329     g_free(str);
1330 out:
1331     visit_free(v);
1332 }
1333
1334 void object_property_parse(Object *obj, const char *string,
1335                            const char *name, Error **errp)
1336 {
1337     Visitor *v = string_input_visitor_new(string);
1338     object_property_set(obj, v, name, errp);
1339     visit_free(v);
1340 }
1341
1342 char *object_property_print(Object *obj, const char *name, bool human,
1343                             Error **errp)
1344 {
1345     Visitor *v;
1346     char *string = NULL;
1347     Error *local_err = NULL;
1348
1349     v = string_output_visitor_new(human, &string);
1350     object_property_get(obj, v, name, &local_err);
1351     if (local_err) {
1352         error_propagate(errp, local_err);
1353         goto out;
1354     }
1355
1356     visit_complete(v, &string);
1357
1358 out:
1359     visit_free(v);
1360     return string;
1361 }
1362
1363 const char *object_property_get_type(Object *obj, const char *name, Error **errp)
1364 {
1365     ObjectProperty *prop = object_property_find(obj, name, errp);
1366     if (prop == NULL) {
1367         return NULL;
1368     }
1369
1370     return prop->type;
1371 }
1372
1373 Object *object_get_root(void)
1374 {
1375     static Object *root;
1376
1377     if (!root) {
1378         root = object_new("container");
1379     }
1380
1381     return root;
1382 }
1383
1384 Object *object_get_objects_root(void)
1385 {
1386     return container_get(object_get_root(), "/objects");
1387 }
1388
1389 Object *object_get_internal_root(void)
1390 {
1391     static Object *internal_root;
1392
1393     if (!internal_root) {
1394         internal_root = object_new("container");
1395     }
1396
1397     return internal_root;
1398 }
1399
1400 static void object_get_child_property(Object *obj, Visitor *v,
1401                                       const char *name, void *opaque,
1402                                       Error **errp)
1403 {
1404     Object *child = opaque;
1405     gchar *path;
1406
1407     path = object_get_canonical_path(child);
1408     visit_type_str(v, name, &path, errp);
1409     g_free(path);
1410 }
1411
1412 static Object *object_resolve_child_property(Object *parent, void *opaque, const gchar *part)
1413 {
1414     return opaque;
1415 }
1416
1417 static void object_finalize_child_property(Object *obj, const char *name,
1418                                            void *opaque)
1419 {
1420     Object *child = opaque;
1421
1422     if (child->class->unparent) {
1423         (child->class->unparent)(child);
1424     }
1425     child->parent = NULL;
1426     object_unref(child);
1427 }
1428
1429 void object_property_add_child(Object *obj, const char *name,
1430                                Object *child, Error **errp)
1431 {
1432     Error *local_err = NULL;
1433     gchar *type;
1434     ObjectProperty *op;
1435
1436     if (child->parent != NULL) {
1437         error_setg(errp, "child object is already parented");
1438         return;
1439     }
1440
1441     type = g_strdup_printf("child<%s>", object_get_typename(OBJECT(child)));
1442
1443     op = object_property_add(obj, name, type, object_get_child_property, NULL,
1444                              object_finalize_child_property, child, &local_err);
1445     if (local_err) {
1446         error_propagate(errp, local_err);
1447         goto out;
1448     }
1449
1450     op->resolve = object_resolve_child_property;
1451     object_ref(child);
1452     child->parent = obj;
1453
1454 out:
1455     g_free(type);
1456 }
1457
1458 void object_property_allow_set_link(const Object *obj, const char *name,
1459                                     Object *val, Error **errp)
1460 {
1461     /* Allow the link to be set, always */
1462 }
1463
1464 typedef struct {
1465     Object **child;
1466     void (*check)(const Object *, const char *, Object *, Error **);
1467     ObjectPropertyLinkFlags flags;
1468 } LinkProperty;
1469
1470 static void object_get_link_property(Object *obj, Visitor *v,
1471                                      const char *name, void *opaque,
1472                                      Error **errp)
1473 {
1474     LinkProperty *lprop = opaque;
1475     Object **child = lprop->child;
1476     gchar *path;
1477
1478     if (*child) {
1479         path = object_get_canonical_path(*child);
1480         visit_type_str(v, name, &path, errp);
1481         g_free(path);
1482     } else {
1483         path = (gchar *)"";
1484         visit_type_str(v, name, &path, errp);
1485     }
1486 }
1487
1488 /*
1489  * object_resolve_link:
1490  *
1491  * Lookup an object and ensure its type matches the link property type.  This
1492  * is similar to object_resolve_path() except type verification against the
1493  * link property is performed.
1494  *
1495  * Returns: The matched object or NULL on path lookup failures.
1496  */
1497 static Object *object_resolve_link(Object *obj, const char *name,
1498                                    const char *path, Error **errp)
1499 {
1500     const char *type;
1501     gchar *target_type;
1502     bool ambiguous = false;
1503     Object *target;
1504
1505     /* Go from link<FOO> to FOO.  */
1506     type = object_property_get_type(obj, name, NULL);
1507     target_type = g_strndup(&type[5], strlen(type) - 6);
1508     target = object_resolve_path_type(path, target_type, &ambiguous);
1509
1510     if (ambiguous) {
1511         error_setg(errp, "Path '%s' does not uniquely identify an object",
1512                    path);
1513     } else if (!target) {
1514         target = object_resolve_path(path, &ambiguous);
1515         if (target || ambiguous) {
1516             error_setg(errp, QERR_INVALID_PARAMETER_TYPE, name, target_type);
1517         } else {
1518             error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1519                       "Device '%s' not found", path);
1520         }
1521         target = NULL;
1522     }
1523     g_free(target_type);
1524
1525     return target;
1526 }
1527
1528 static void object_set_link_property(Object *obj, Visitor *v,
1529                                      const char *name, void *opaque,
1530                                      Error **errp)
1531 {
1532     Error *local_err = NULL;
1533     LinkProperty *prop = opaque;
1534     Object **child = prop->child;
1535     Object *old_target = *child;
1536     Object *new_target = NULL;
1537     char *path = NULL;
1538
1539     visit_type_str(v, name, &path, &local_err);
1540
1541     if (!local_err && strcmp(path, "") != 0) {
1542         new_target = object_resolve_link(obj, name, path, &local_err);
1543     }
1544
1545     g_free(path);
1546     if (local_err) {
1547         error_propagate(errp, local_err);
1548         return;
1549     }
1550
1551     prop->check(obj, name, new_target, &local_err);
1552     if (local_err) {
1553         error_propagate(errp, local_err);
1554         return;
1555     }
1556
1557     object_ref(new_target);
1558     *child = new_target;
1559     object_unref(old_target);
1560 }
1561
1562 static Object *object_resolve_link_property(Object *parent, void *opaque, const gchar *part)
1563 {
1564     LinkProperty *lprop = opaque;
1565
1566     return *lprop->child;
1567 }
1568
1569 static void object_release_link_property(Object *obj, const char *name,
1570                                          void *opaque)
1571 {
1572     LinkProperty *prop = opaque;
1573
1574     if ((prop->flags & OBJ_PROP_LINK_UNREF_ON_RELEASE) && *prop->child) {
1575         object_unref(*prop->child);
1576     }
1577     g_free(prop);
1578 }
1579
1580 void object_property_add_link(Object *obj, const char *name,
1581                               const char *type, Object **child,
1582                               void (*check)(const Object *, const char *,
1583                                             Object *, Error **),
1584                               ObjectPropertyLinkFlags flags,
1585                               Error **errp)
1586 {
1587     Error *local_err = NULL;
1588     LinkProperty *prop = g_malloc(sizeof(*prop));
1589     gchar *full_type;
1590     ObjectProperty *op;
1591
1592     prop->child = child;
1593     prop->check = check;
1594     prop->flags = flags;
1595
1596     full_type = g_strdup_printf("link<%s>", type);
1597
1598     op = object_property_add(obj, name, full_type,
1599                              object_get_link_property,
1600                              check ? object_set_link_property : NULL,
1601                              object_release_link_property,
1602                              prop,
1603                              &local_err);
1604     if (local_err) {
1605         error_propagate(errp, local_err);
1606         g_free(prop);
1607         goto out;
1608     }
1609
1610     op->resolve = object_resolve_link_property;
1611
1612 out:
1613     g_free(full_type);
1614 }
1615
1616 void object_property_add_const_link(Object *obj, const char *name,
1617                                     Object *target, Error **errp)
1618 {
1619     char *link_type;
1620     ObjectProperty *op;
1621
1622     link_type = g_strdup_printf("link<%s>", object_get_typename(target));
1623     op = object_property_add(obj, name, link_type,
1624                              object_get_child_property, NULL,
1625                              NULL, target, errp);
1626     if (op != NULL) {
1627         op->resolve = object_resolve_child_property;
1628     }
1629     g_free(link_type);
1630 }
1631
1632 gchar *object_get_canonical_path_component(Object *obj)
1633 {
1634     ObjectProperty *prop = NULL;
1635     GHashTableIter iter;
1636
1637     g_assert(obj);
1638     g_assert(obj->parent != NULL);
1639
1640     g_hash_table_iter_init(&iter, obj->parent->properties);
1641     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1642         if (!object_property_is_child(prop)) {
1643             continue;
1644         }
1645
1646         if (prop->opaque == obj) {
1647             return g_strdup(prop->name);
1648         }
1649     }
1650
1651     /* obj had a parent but was not a child, should never happen */
1652     g_assert_not_reached();
1653     return NULL;
1654 }
1655
1656 gchar *object_get_canonical_path(Object *obj)
1657 {
1658     Object *root = object_get_root();
1659     char *newpath, *path = NULL;
1660
1661     while (obj != root) {
1662         char *component = object_get_canonical_path_component(obj);
1663
1664         if (path) {
1665             newpath = g_strdup_printf("%s/%s", component, path);
1666             g_free(component);
1667             g_free(path);
1668             path = newpath;
1669         } else {
1670             path = component;
1671         }
1672
1673         obj = obj->parent;
1674     }
1675
1676     newpath = g_strdup_printf("/%s", path ? path : "");
1677     g_free(path);
1678
1679     return newpath;
1680 }
1681
1682 Object *object_resolve_path_component(Object *parent, const gchar *part)
1683 {
1684     ObjectProperty *prop = object_property_find(parent, part, NULL);
1685     if (prop == NULL) {
1686         return NULL;
1687     }
1688
1689     if (prop->resolve) {
1690         return prop->resolve(parent, prop->opaque, part);
1691     } else {
1692         return NULL;
1693     }
1694 }
1695
1696 static Object *object_resolve_abs_path(Object *parent,
1697                                           gchar **parts,
1698                                           const char *typename,
1699                                           int index)
1700 {
1701     Object *child;
1702
1703     if (parts[index] == NULL) {
1704         return object_dynamic_cast(parent, typename);
1705     }
1706
1707     if (strcmp(parts[index], "") == 0) {
1708         return object_resolve_abs_path(parent, parts, typename, index + 1);
1709     }
1710
1711     child = object_resolve_path_component(parent, parts[index]);
1712     if (!child) {
1713         return NULL;
1714     }
1715
1716     return object_resolve_abs_path(child, parts, typename, index + 1);
1717 }
1718
1719 static Object *object_resolve_partial_path(Object *parent,
1720                                               gchar **parts,
1721                                               const char *typename,
1722                                               bool *ambiguous)
1723 {
1724     Object *obj;
1725     GHashTableIter iter;
1726     ObjectProperty *prop;
1727
1728     obj = object_resolve_abs_path(parent, parts, typename, 0);
1729
1730     g_hash_table_iter_init(&iter, parent->properties);
1731     while (g_hash_table_iter_next(&iter, NULL, (gpointer *)&prop)) {
1732         Object *found;
1733
1734         if (!object_property_is_child(prop)) {
1735             continue;
1736         }
1737
1738         found = object_resolve_partial_path(prop->opaque, parts,
1739                                             typename, ambiguous);
1740         if (found) {
1741             if (obj) {
1742                 *ambiguous = true;
1743                 return NULL;
1744             }
1745             obj = found;
1746         }
1747
1748         if (*ambiguous) {
1749             return NULL;
1750         }
1751     }
1752
1753     return obj;
1754 }
1755
1756 Object *object_resolve_path_type(const char *path, const char *typename,
1757                                  bool *ambiguousp)
1758 {
1759     Object *obj;
1760     gchar **parts;
1761
1762     parts = g_strsplit(path, "/", 0);
1763     assert(parts);
1764
1765     if (parts[0] == NULL || strcmp(parts[0], "") != 0) {
1766         bool ambiguous = false;
1767         obj = object_resolve_partial_path(object_get_root(), parts,
1768                                           typename, &ambiguous);
1769         if (ambiguousp) {
1770             *ambiguousp = ambiguous;
1771         }
1772     } else {
1773         obj = object_resolve_abs_path(object_get_root(), parts, typename, 1);
1774     }
1775
1776     g_strfreev(parts);
1777
1778     return obj;
1779 }
1780
1781 Object *object_resolve_path(const char *path, bool *ambiguous)
1782 {
1783     return object_resolve_path_type(path, TYPE_OBJECT, ambiguous);
1784 }
1785
1786 typedef struct StringProperty
1787 {
1788     char *(*get)(Object *, Error **);
1789     void (*set)(Object *, const char *, Error **);
1790 } StringProperty;
1791
1792 static void property_get_str(Object *obj, Visitor *v, const char *name,
1793                              void *opaque, Error **errp)
1794 {
1795     StringProperty *prop = opaque;
1796     char *value;
1797     Error *err = NULL;
1798
1799     value = prop->get(obj, &err);
1800     if (err) {
1801         error_propagate(errp, err);
1802         return;
1803     }
1804
1805     visit_type_str(v, name, &value, errp);
1806     g_free(value);
1807 }
1808
1809 static void property_set_str(Object *obj, Visitor *v, const char *name,
1810                              void *opaque, Error **errp)
1811 {
1812     StringProperty *prop = opaque;
1813     char *value;
1814     Error *local_err = NULL;
1815
1816     visit_type_str(v, name, &value, &local_err);
1817     if (local_err) {
1818         error_propagate(errp, local_err);
1819         return;
1820     }
1821
1822     prop->set(obj, value, errp);
1823     g_free(value);
1824 }
1825
1826 static void property_release_str(Object *obj, const char *name,
1827                                  void *opaque)
1828 {
1829     StringProperty *prop = opaque;
1830     g_free(prop);
1831 }
1832
1833 void object_property_add_str(Object *obj, const char *name,
1834                            char *(*get)(Object *, Error **),
1835                            void (*set)(Object *, const char *, Error **),
1836                            Error **errp)
1837 {
1838     Error *local_err = NULL;
1839     StringProperty *prop = g_malloc0(sizeof(*prop));
1840
1841     prop->get = get;
1842     prop->set = set;
1843
1844     object_property_add(obj, name, "string",
1845                         get ? property_get_str : NULL,
1846                         set ? property_set_str : NULL,
1847                         property_release_str,
1848                         prop, &local_err);
1849     if (local_err) {
1850         error_propagate(errp, local_err);
1851         g_free(prop);
1852     }
1853 }
1854
1855 void object_class_property_add_str(ObjectClass *klass, const char *name,
1856                                    char *(*get)(Object *, Error **),
1857                                    void (*set)(Object *, const char *,
1858                                                Error **),
1859                                    Error **errp)
1860 {
1861     Error *local_err = NULL;
1862     StringProperty *prop = g_malloc0(sizeof(*prop));
1863
1864     prop->get = get;
1865     prop->set = set;
1866
1867     object_class_property_add(klass, name, "string",
1868                               get ? property_get_str : NULL,
1869                               set ? property_set_str : NULL,
1870                               property_release_str,
1871                               prop, &local_err);
1872     if (local_err) {
1873         error_propagate(errp, local_err);
1874         g_free(prop);
1875     }
1876 }
1877
1878 typedef struct BoolProperty
1879 {
1880     bool (*get)(Object *, Error **);
1881     void (*set)(Object *, bool, Error **);
1882 } BoolProperty;
1883
1884 static void property_get_bool(Object *obj, Visitor *v, const char *name,
1885                               void *opaque, Error **errp)
1886 {
1887     BoolProperty *prop = opaque;
1888     bool value;
1889     Error *err = NULL;
1890
1891     value = prop->get(obj, &err);
1892     if (err) {
1893         error_propagate(errp, err);
1894         return;
1895     }
1896
1897     visit_type_bool(v, name, &value, errp);
1898 }
1899
1900 static void property_set_bool(Object *obj, Visitor *v, const char *name,
1901                               void *opaque, Error **errp)
1902 {
1903     BoolProperty *prop = opaque;
1904     bool value;
1905     Error *local_err = NULL;
1906
1907     visit_type_bool(v, name, &value, &local_err);
1908     if (local_err) {
1909         error_propagate(errp, local_err);
1910         return;
1911     }
1912
1913     prop->set(obj, value, errp);
1914 }
1915
1916 static void property_release_bool(Object *obj, const char *name,
1917                                   void *opaque)
1918 {
1919     BoolProperty *prop = opaque;
1920     g_free(prop);
1921 }
1922
1923 void object_property_add_bool(Object *obj, const char *name,
1924                               bool (*get)(Object *, Error **),
1925                               void (*set)(Object *, bool, Error **),
1926                               Error **errp)
1927 {
1928     Error *local_err = NULL;
1929     BoolProperty *prop = g_malloc0(sizeof(*prop));
1930
1931     prop->get = get;
1932     prop->set = set;
1933
1934     object_property_add(obj, name, "bool",
1935                         get ? property_get_bool : NULL,
1936                         set ? property_set_bool : NULL,
1937                         property_release_bool,
1938                         prop, &local_err);
1939     if (local_err) {
1940         error_propagate(errp, local_err);
1941         g_free(prop);
1942     }
1943 }
1944
1945 void object_class_property_add_bool(ObjectClass *klass, const char *name,
1946                                     bool (*get)(Object *, Error **),
1947                                     void (*set)(Object *, bool, Error **),
1948                                     Error **errp)
1949 {
1950     Error *local_err = NULL;
1951     BoolProperty *prop = g_malloc0(sizeof(*prop));
1952
1953     prop->get = get;
1954     prop->set = set;
1955
1956     object_class_property_add(klass, name, "bool",
1957                               get ? property_get_bool : NULL,
1958                               set ? property_set_bool : NULL,
1959                               property_release_bool,
1960                               prop, &local_err);
1961     if (local_err) {
1962         error_propagate(errp, local_err);
1963         g_free(prop);
1964     }
1965 }
1966
1967 static void property_get_enum(Object *obj, Visitor *v, const char *name,
1968                               void *opaque, Error **errp)
1969 {
1970     EnumProperty *prop = opaque;
1971     int value;
1972     Error *err = NULL;
1973
1974     value = prop->get(obj, &err);
1975     if (err) {
1976         error_propagate(errp, err);
1977         return;
1978     }
1979
1980     visit_type_enum(v, name, &value, prop->lookup, errp);
1981 }
1982
1983 static void property_set_enum(Object *obj, Visitor *v, const char *name,
1984                               void *opaque, Error **errp)
1985 {
1986     EnumProperty *prop = opaque;
1987     int value;
1988     Error *err = NULL;
1989
1990     visit_type_enum(v, name, &value, prop->lookup, &err);
1991     if (err) {
1992         error_propagate(errp, err);
1993         return;
1994     }
1995     prop->set(obj, value, errp);
1996 }
1997
1998 static void property_release_enum(Object *obj, const char *name,
1999                                   void *opaque)
2000 {
2001     EnumProperty *prop = opaque;
2002     g_free(prop);
2003 }
2004
2005 void object_property_add_enum(Object *obj, const char *name,
2006                               const char *typename,
2007                               const QEnumLookup *lookup,
2008                               int (*get)(Object *, Error **),
2009                               void (*set)(Object *, int, Error **),
2010                               Error **errp)
2011 {
2012     Error *local_err = NULL;
2013     EnumProperty *prop = g_malloc(sizeof(*prop));
2014
2015     prop->lookup = lookup;
2016     prop->get = get;
2017     prop->set = set;
2018
2019     object_property_add(obj, name, typename,
2020                         get ? property_get_enum : NULL,
2021                         set ? property_set_enum : NULL,
2022                         property_release_enum,
2023                         prop, &local_err);
2024     if (local_err) {
2025         error_propagate(errp, local_err);
2026         g_free(prop);
2027     }
2028 }
2029
2030 void object_class_property_add_enum(ObjectClass *klass, const char *name,
2031                                     const char *typename,
2032                                     const QEnumLookup *lookup,
2033                                     int (*get)(Object *, Error **),
2034                                     void (*set)(Object *, int, Error **),
2035                                     Error **errp)
2036 {
2037     Error *local_err = NULL;
2038     EnumProperty *prop = g_malloc(sizeof(*prop));
2039
2040     prop->lookup = lookup;
2041     prop->get = get;
2042     prop->set = set;
2043
2044     object_class_property_add(klass, name, typename,
2045                               get ? property_get_enum : NULL,
2046                               set ? property_set_enum : NULL,
2047                               property_release_enum,
2048                               prop, &local_err);
2049     if (local_err) {
2050         error_propagate(errp, local_err);
2051         g_free(prop);
2052     }
2053 }
2054
2055 typedef struct TMProperty {
2056     void (*get)(Object *, struct tm *, Error **);
2057 } TMProperty;
2058
2059 static void property_get_tm(Object *obj, Visitor *v, const char *name,
2060                             void *opaque, Error **errp)
2061 {
2062     TMProperty *prop = opaque;
2063     Error *err = NULL;
2064     struct tm value;
2065
2066     prop->get(obj, &value, &err);
2067     if (err) {
2068         goto out;
2069     }
2070
2071     visit_start_struct(v, name, NULL, 0, &err);
2072     if (err) {
2073         goto out;
2074     }
2075     visit_type_int32(v, "tm_year", &value.tm_year, &err);
2076     if (err) {
2077         goto out_end;
2078     }
2079     visit_type_int32(v, "tm_mon", &value.tm_mon, &err);
2080     if (err) {
2081         goto out_end;
2082     }
2083     visit_type_int32(v, "tm_mday", &value.tm_mday, &err);
2084     if (err) {
2085         goto out_end;
2086     }
2087     visit_type_int32(v, "tm_hour", &value.tm_hour, &err);
2088     if (err) {
2089         goto out_end;
2090     }
2091     visit_type_int32(v, "tm_min", &value.tm_min, &err);
2092     if (err) {
2093         goto out_end;
2094     }
2095     visit_type_int32(v, "tm_sec", &value.tm_sec, &err);
2096     if (err) {
2097         goto out_end;
2098     }
2099     visit_check_struct(v, &err);
2100 out_end:
2101     visit_end_struct(v, NULL);
2102 out:
2103     error_propagate(errp, err);
2104
2105 }
2106
2107 static void property_release_tm(Object *obj, const char *name,
2108                                 void *opaque)
2109 {
2110     TMProperty *prop = opaque;
2111     g_free(prop);
2112 }
2113
2114 void object_property_add_tm(Object *obj, const char *name,
2115                             void (*get)(Object *, struct tm *, Error **),
2116                             Error **errp)
2117 {
2118     Error *local_err = NULL;
2119     TMProperty *prop = g_malloc0(sizeof(*prop));
2120
2121     prop->get = get;
2122
2123     object_property_add(obj, name, "struct tm",
2124                         get ? property_get_tm : NULL, NULL,
2125                         property_release_tm,
2126                         prop, &local_err);
2127     if (local_err) {
2128         error_propagate(errp, local_err);
2129         g_free(prop);
2130     }
2131 }
2132
2133 void object_class_property_add_tm(ObjectClass *klass, const char *name,
2134                                   void (*get)(Object *, struct tm *, Error **),
2135                                   Error **errp)
2136 {
2137     Error *local_err = NULL;
2138     TMProperty *prop = g_malloc0(sizeof(*prop));
2139
2140     prop->get = get;
2141
2142     object_class_property_add(klass, name, "struct tm",
2143                               get ? property_get_tm : NULL, NULL,
2144                               property_release_tm,
2145                               prop, &local_err);
2146     if (local_err) {
2147         error_propagate(errp, local_err);
2148         g_free(prop);
2149     }
2150 }
2151
2152 static char *qdev_get_type(Object *obj, Error **errp)
2153 {
2154     return g_strdup(object_get_typename(obj));
2155 }
2156
2157 static void property_get_uint8_ptr(Object *obj, Visitor *v, const char *name,
2158                                    void *opaque, Error **errp)
2159 {
2160     uint8_t value = *(uint8_t *)opaque;
2161     visit_type_uint8(v, name, &value, errp);
2162 }
2163
2164 static void property_get_uint16_ptr(Object *obj, Visitor *v, const char *name,
2165                                     void *opaque, Error **errp)
2166 {
2167     uint16_t value = *(uint16_t *)opaque;
2168     visit_type_uint16(v, name, &value, errp);
2169 }
2170
2171 static void property_get_uint32_ptr(Object *obj, Visitor *v, const char *name,
2172                                     void *opaque, Error **errp)
2173 {
2174     uint32_t value = *(uint32_t *)opaque;
2175     visit_type_uint32(v, name, &value, errp);
2176 }
2177
2178 static void property_get_uint64_ptr(Object *obj, Visitor *v, const char *name,
2179                                     void *opaque, Error **errp)
2180 {
2181     uint64_t value = *(uint64_t *)opaque;
2182     visit_type_uint64(v, name, &value, errp);
2183 }
2184
2185 void object_property_add_uint8_ptr(Object *obj, const char *name,
2186                                    const uint8_t *v, Error **errp)
2187 {
2188     object_property_add(obj, name, "uint8", property_get_uint8_ptr,
2189                         NULL, NULL, (void *)v, errp);
2190 }
2191
2192 void object_class_property_add_uint8_ptr(ObjectClass *klass, const char *name,
2193                                          const uint8_t *v, Error **errp)
2194 {
2195     object_class_property_add(klass, name, "uint8", property_get_uint8_ptr,
2196                               NULL, NULL, (void *)v, errp);
2197 }
2198
2199 void object_property_add_uint16_ptr(Object *obj, const char *name,
2200                                     const uint16_t *v, Error **errp)
2201 {
2202     object_property_add(obj, name, "uint16", property_get_uint16_ptr,
2203                         NULL, NULL, (void *)v, errp);
2204 }
2205
2206 void object_class_property_add_uint16_ptr(ObjectClass *klass, const char *name,
2207                                           const uint16_t *v, Error **errp)
2208 {
2209     object_class_property_add(klass, name, "uint16", property_get_uint16_ptr,
2210                               NULL, NULL, (void *)v, errp);
2211 }
2212
2213 void object_property_add_uint32_ptr(Object *obj, const char *name,
2214                                     const uint32_t *v, Error **errp)
2215 {
2216     object_property_add(obj, name, "uint32", property_get_uint32_ptr,
2217                         NULL, NULL, (void *)v, errp);
2218 }
2219
2220 void object_class_property_add_uint32_ptr(ObjectClass *klass, const char *name,
2221                                           const uint32_t *v, Error **errp)
2222 {
2223     object_class_property_add(klass, name, "uint32", property_get_uint32_ptr,
2224                               NULL, NULL, (void *)v, errp);
2225 }
2226
2227 void object_property_add_uint64_ptr(Object *obj, const char *name,
2228                                     const uint64_t *v, Error **errp)
2229 {
2230     object_property_add(obj, name, "uint64", property_get_uint64_ptr,
2231                         NULL, NULL, (void *)v, errp);
2232 }
2233
2234 void object_class_property_add_uint64_ptr(ObjectClass *klass, const char *name,
2235                                           const uint64_t *v, Error **errp)
2236 {
2237     object_class_property_add(klass, name, "uint64", property_get_uint64_ptr,
2238                               NULL, NULL, (void *)v, errp);
2239 }
2240
2241 typedef struct {
2242     Object *target_obj;
2243     char *target_name;
2244 } AliasProperty;
2245
2246 static void property_get_alias(Object *obj, Visitor *v, const char *name,
2247                                void *opaque, Error **errp)
2248 {
2249     AliasProperty *prop = opaque;
2250
2251     object_property_get(prop->target_obj, v, prop->target_name, errp);
2252 }
2253
2254 static void property_set_alias(Object *obj, Visitor *v, const char *name,
2255                                void *opaque, Error **errp)
2256 {
2257     AliasProperty *prop = opaque;
2258
2259     object_property_set(prop->target_obj, v, prop->target_name, errp);
2260 }
2261
2262 static Object *property_resolve_alias(Object *obj, void *opaque,
2263                                       const gchar *part)
2264 {
2265     AliasProperty *prop = opaque;
2266
2267     return object_resolve_path_component(prop->target_obj, prop->target_name);
2268 }
2269
2270 static void property_release_alias(Object *obj, const char *name, void *opaque)
2271 {
2272     AliasProperty *prop = opaque;
2273
2274     g_free(prop->target_name);
2275     g_free(prop);
2276 }
2277
2278 void object_property_add_alias(Object *obj, const char *name,
2279                                Object *target_obj, const char *target_name,
2280                                Error **errp)
2281 {
2282     AliasProperty *prop;
2283     ObjectProperty *op;
2284     ObjectProperty *target_prop;
2285     gchar *prop_type;
2286     Error *local_err = NULL;
2287
2288     target_prop = object_property_find(target_obj, target_name, errp);
2289     if (!target_prop) {
2290         return;
2291     }
2292
2293     if (object_property_is_child(target_prop)) {
2294         prop_type = g_strdup_printf("link%s",
2295                                     target_prop->type + strlen("child"));
2296     } else {
2297         prop_type = g_strdup(target_prop->type);
2298     }
2299
2300     prop = g_malloc(sizeof(*prop));
2301     prop->target_obj = target_obj;
2302     prop->target_name = g_strdup(target_name);
2303
2304     op = object_property_add(obj, name, prop_type,
2305                              property_get_alias,
2306                              property_set_alias,
2307                              property_release_alias,
2308                              prop, &local_err);
2309     if (local_err) {
2310         error_propagate(errp, local_err);
2311         g_free(prop);
2312         goto out;
2313     }
2314     op->resolve = property_resolve_alias;
2315
2316     object_property_set_description(obj, op->name,
2317                                     target_prop->description,
2318                                     &error_abort);
2319
2320 out:
2321     g_free(prop_type);
2322 }
2323
2324 void object_property_set_description(Object *obj, const char *name,
2325                                      const char *description, Error **errp)
2326 {
2327     ObjectProperty *op;
2328
2329     op = object_property_find(obj, name, errp);
2330     if (!op) {
2331         return;
2332     }
2333
2334     g_free(op->description);
2335     op->description = g_strdup(description);
2336 }
2337
2338 void object_class_property_set_description(ObjectClass *klass,
2339                                            const char *name,
2340                                            const char *description,
2341                                            Error **errp)
2342 {
2343     ObjectProperty *op;
2344
2345     op = g_hash_table_lookup(klass->properties, name);
2346     if (!op) {
2347         error_setg(errp, "Property '.%s' not found", name);
2348         return;
2349     }
2350
2351     g_free(op->description);
2352     op->description = g_strdup(description);
2353 }
2354
2355 static void object_instance_init(Object *obj)
2356 {
2357     object_property_add_str(obj, "type", qdev_get_type, NULL, NULL);
2358 }
2359
2360 static void register_types(void)
2361 {
2362     static TypeInfo interface_info = {
2363         .name = TYPE_INTERFACE,
2364         .class_size = sizeof(InterfaceClass),
2365         .abstract = true,
2366     };
2367
2368     static TypeInfo object_info = {
2369         .name = TYPE_OBJECT,
2370         .instance_size = sizeof(Object),
2371         .instance_init = object_instance_init,
2372         .abstract = true,
2373     };
2374
2375     type_interface = type_register_internal(&interface_info);
2376     type_register_internal(&object_info);
2377 }
2378
2379 type_init(register_types)